Direct numerical simulation of the self-noise radiated by an airfoil in a narrow stream

Abstract

A direct numerical simulation (DNS) is conducted for the first time of an airfoil that is embedded in a wind-tunnel flow at a realistically high Reynolds number of Rec = 150, 000, based on the chord length. The nominal wind-tunnel speed corresponds to a Mach number of M = 0.25. The simulation domain comprises only the near field around the airfoil; the aerodynamic effect of the wind tunnel is included by using an appropriate set of inflow boundary profiles-a technique that has been used successfully in previous numerical airfoil studies by the authors of this paper. The boundary layer on the airfoil suction side is tripped using a purposely developed immersed-boundary method (IMBM). The resu..